Home / 143,790.40-215,685.60-90,646.30

Finding the Fourth Proportional to 143,790.40, 215,685.60 and 90,646.30

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Solution

The fourth proportional to 143,790.40, 215,685.60 and 90,646.30 is: 135,969.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,790.40 : 215,685.60 = 90,646.30 : x
  2. Step 2: Convert to fraction form
    143,790.40/215,685.60 = 90,646.30/x
  3. Step 3: Cross multiply
    143,790.40x = 215,685.60 × 90,646.30
  4. Step 4: Simplify right side
    143,790.40x = 19,551,101,603.28
  5. Step 5: Solve for x
    x = 19,551,101,603.28/143,790.40
  6. Step 6: Final answer
    x = 135,969.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.